Oblicz pole i obwód prostokąta o bokach :
a) 3m i 7m
b) 10 dm i 4 dm
c) 13 mm i 8 mm
d) 7cm i 9cm
e) 5km i 8km .
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a)
P=3m*7m=21m²
Obw=3m*2+7m*2=6m+14m=20m
b)
P=10dm*4dm=40dm²
Obw=10dm*2+4dm*2=20dm+8dm=28dm
c)
P=13mm*8mm=104mm²
Obw=13mm*2+8mm*2=26mm+16mm=42mm
d)
P=7cm*9cm=63cm²
Obw=7cm*2+9cm*2=14cm+18cm=32cm
e)
P=5km*8km=40km²
Obw=5km*2+8km*2=10km+16km=26km